{"id":84745,"date":"2025-06-01T02:48:09","date_gmt":"2025-06-01T02:48:09","guid":{"rendered":"https:\/\/exam.pscnotes.com\/mcq\/?p=84745"},"modified":"2025-06-01T02:48:09","modified_gmt":"2025-06-01T02:48:09","slug":"consider-the-following-statements-there-is-no-net-moment-on-a-body","status":"publish","type":"post","link":"https:\/\/exam.pscnotes.com\/mcq\/consider-the-following-statements-there-is-no-net-moment-on-a-body\/","title":{"rendered":"Consider the following statements:\n \n There is no net moment on a body"},"content":{"rendered":"<p>Consider the following statements:<\/p>\n<ul>\n<li>There is no net moment on a body which is in equilibrium.<\/li>\n<li>The momentum of a body is always conserved.<\/li>\n<li>The kinetic energy of an object is always conserved.<\/li>\n<\/ul>\n<p>Which of the statements given above is\/are correct?<\/p>\n<p>[amp_mcq option1=&#8221;1, 2 and 3&#8243; option2=&#8221;2 and 3 only&#8221; option3=&#8221;1 and 2 only&#8221; option4=&#8221;1 only&#8221; correct=&#8221;option4&#8243;]<\/p>\n<div class=\"psc-box-pyq-exam-year-detail\">\n<div class=\"pyq-exam\">\n<div class=\"psc-heading\">This question was previously asked in<\/div>\n<div class=\"psc-title line-ellipsis\">UPSC CDS-1 &#8211; 2018<\/div>\n<\/div>\n<div class=\"pyq-exam-psc-buttons\"><a href=\"\/pyq\/pyq-upsc-cds-1-2018.pdf\" target=\"_blank\" class=\"psc-pdf-button\" rel=\"noopener\">Download PDF<\/a><a href=\"\/pyq-upsc-cds-1-2018\" target=\"_blank\" class=\"psc-attempt-button\" rel=\"noopener\">Attempt Online<\/a><\/div>\n<\/div>\n<section id=\"pyq-correct-answer\">\nLet&#8217;s evaluate each statement:<br \/>\n1. There is no net moment on a body which is in equilibrium. This is correct. A body is in rotational equilibrium if the net torque (moment) acting on it is zero. For complete equilibrium (translational and rotational), both the net force and net moment must be zero.<br \/>\n2. The momentum of a body is always conserved. This is incorrect. The momentum of a body is conserved only if the net external force acting on it is zero. If a net force acts on a body, its momentum changes according to Newton&#8217;s second law (F = dp\/dt).<br \/>\n3. The kinetic energy of an object is always conserved. This is incorrect. Kinetic energy is conserved only in specific situations, such as elastic collisions where no energy is lost as heat, sound, or deformation, and when no non-conservative forces (like friction) do work on the object, and no external forces change its speed. For example, when an object falls under gravity, its kinetic energy increases.<br \/>\nOnly statement 1 is correct.<br \/>\n<\/section>\n<section id=\"pyq-key-points\">\n&#8211; Equilibrium implies zero net force (translational equilibrium) and zero net torque or moment (rotational equilibrium).<br \/>\n&#8211; Momentum of a system is conserved in the absence of external forces. Momentum of a single body is conserved only if the net force on it is zero.<br \/>\n&#8211; Kinetic energy of an object is conserved only if no net work is done on it by non-conservative forces or if the system is isolated and interactions are perfectly elastic.<br \/>\n<\/section>\n<section id=\"pyq-additional-information\">\nConservation laws (momentum, energy, angular momentum) are fundamental in physics, but their application requires careful definition of the system and consideration of external interactions (forces, torques). &#8220;Always conserved&#8221; statements for a single body or general process are usually incorrect unless specific conditions are met.<br \/>\n<\/section>\n","protected":false},"excerpt":{"rendered":"<p>Consider the following statements: There is no net moment on a body which is in equilibrium. The momentum of a body is always conserved. The kinetic energy of an object is always conserved. Which of the statements given above is\/are correct? [amp_mcq option1=&#8221;1, 2 and 3&#8243; option2=&#8221;2 and 3 only&#8221; option3=&#8221;1 and 2 only&#8221; option4=&#8221;1 &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"Consider the following statements:\n \n There is no net moment on a body\" class=\"read-more button\" href=\"https:\/\/exam.pscnotes.com\/mcq\/consider-the-following-statements-there-is-no-net-moment-on-a-body\/#more-84745\">Detailed Solution<span class=\"screen-reader-text\">Consider the following statements:<\/p>\n<p> There is no net moment on a body<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1087],"tags":[1114,1129,1128],"class_list":["post-84745","post","type-post","status-publish","format-standard","hentry","category-upsc-cds-1","tag-1114","tag-mechanics","tag-physics","no-featured-image-padding"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.2 (Yoast SEO v23.3) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Consider the following statements:  There is no net moment on a body<\/title>\n<meta name=\"description\" content=\"Let&#039;s evaluate each statement: 1. There is no net moment on a body which is in equilibrium. This is correct. A body is in rotational equilibrium if the net torque (moment) acting on it is zero. For complete equilibrium (translational and rotational), both the net force and net moment must be zero. 2. The momentum of a body is always conserved. This is incorrect. The momentum of a body is conserved only if the net external force acting on it is zero. If a net force acts on a body, its momentum changes according to Newton&#039;s second law (F = dp\/dt). 3. The kinetic energy of an object is always conserved. This is incorrect. Kinetic energy is conserved only in specific situations, such as elastic collisions where no energy is lost as heat, sound, or deformation, and when no non-conservative forces (like friction) do work on the object, and no external forces change its speed. For example, when an object falls under gravity, its kinetic energy increases. Only statement 1 is correct. - Equilibrium implies zero net force (translational equilibrium) and zero net torque or moment (rotational equilibrium). - Momentum of a system is conserved in the absence of external forces. Momentum of a single body is conserved only if the net force on it is zero. - Kinetic energy of an object is conserved only if no net work is done on it by non-conservative forces or if the system is isolated and interactions are perfectly elastic.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/exam.pscnotes.com\/mcq\/consider-the-following-statements-there-is-no-net-moment-on-a-body\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Consider the following statements:  There is no net moment on a body\" \/>\n<meta property=\"og:description\" content=\"Let&#039;s evaluate each statement: 1. There is no net moment on a body which is in equilibrium. This is correct. A body is in rotational equilibrium if the net torque (moment) acting on it is zero. For complete equilibrium (translational and rotational), both the net force and net moment must be zero. 2. The momentum of a body is always conserved. This is incorrect. The momentum of a body is conserved only if the net external force acting on it is zero. If a net force acts on a body, its momentum changes according to Newton&#039;s second law (F = dp\/dt). 3. The kinetic energy of an object is always conserved. This is incorrect. Kinetic energy is conserved only in specific situations, such as elastic collisions where no energy is lost as heat, sound, or deformation, and when no non-conservative forces (like friction) do work on the object, and no external forces change its speed. For example, when an object falls under gravity, its kinetic energy increases. Only statement 1 is correct. - Equilibrium implies zero net force (translational equilibrium) and zero net torque or moment (rotational equilibrium). - Momentum of a system is conserved in the absence of external forces. Momentum of a single body is conserved only if the net force on it is zero. - Kinetic energy of an object is conserved only if no net work is done on it by non-conservative forces or if the system is isolated and interactions are perfectly elastic.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/exam.pscnotes.com\/mcq\/consider-the-following-statements-there-is-no-net-moment-on-a-body\/\" \/>\n<meta property=\"og:site_name\" content=\"MCQ and Quiz for Exams\" \/>\n<meta property=\"article:published_time\" content=\"2025-06-01T02:48:09+00:00\" \/>\n<meta name=\"author\" content=\"rawan239\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"rawan239\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<!-- \/ Yoast SEO Premium plugin. -->","yoast_head_json":{"title":"Consider the following statements:  There is no net moment on a body","description":"Let's evaluate each statement: 1. There is no net moment on a body which is in equilibrium. This is correct. A body is in rotational equilibrium if the net torque (moment) acting on it is zero. For complete equilibrium (translational and rotational), both the net force and net moment must be zero. 2. The momentum of a body is always conserved. This is incorrect. The momentum of a body is conserved only if the net external force acting on it is zero. If a net force acts on a body, its momentum changes according to Newton's second law (F = dp\/dt). 3. The kinetic energy of an object is always conserved. This is incorrect. Kinetic energy is conserved only in specific situations, such as elastic collisions where no energy is lost as heat, sound, or deformation, and when no non-conservative forces (like friction) do work on the object, and no external forces change its speed. For example, when an object falls under gravity, its kinetic energy increases. Only statement 1 is correct. - Equilibrium implies zero net force (translational equilibrium) and zero net torque or moment (rotational equilibrium). - Momentum of a system is conserved in the absence of external forces. Momentum of a single body is conserved only if the net force on it is zero. - Kinetic energy of an object is conserved only if no net work is done on it by non-conservative forces or if the system is isolated and interactions are perfectly elastic.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/exam.pscnotes.com\/mcq\/consider-the-following-statements-there-is-no-net-moment-on-a-body\/","og_locale":"en_US","og_type":"article","og_title":"Consider the following statements:  There is no net moment on a body","og_description":"Let's evaluate each statement: 1. There is no net moment on a body which is in equilibrium. This is correct. A body is in rotational equilibrium if the net torque (moment) acting on it is zero. For complete equilibrium (translational and rotational), both the net force and net moment must be zero. 2. The momentum of a body is always conserved. This is incorrect. The momentum of a body is conserved only if the net external force acting on it is zero. If a net force acts on a body, its momentum changes according to Newton's second law (F = dp\/dt). 3. The kinetic energy of an object is always conserved. This is incorrect. Kinetic energy is conserved only in specific situations, such as elastic collisions where no energy is lost as heat, sound, or deformation, and when no non-conservative forces (like friction) do work on the object, and no external forces change its speed. For example, when an object falls under gravity, its kinetic energy increases. Only statement 1 is correct. - Equilibrium implies zero net force (translational equilibrium) and zero net torque or moment (rotational equilibrium). - Momentum of a system is conserved in the absence of external forces. Momentum of a single body is conserved only if the net force on it is zero. - Kinetic energy of an object is conserved only if no net work is done on it by non-conservative forces or if the system is isolated and interactions are perfectly elastic.","og_url":"https:\/\/exam.pscnotes.com\/mcq\/consider-the-following-statements-there-is-no-net-moment-on-a-body\/","og_site_name":"MCQ and Quiz for Exams","article_published_time":"2025-06-01T02:48:09+00:00","author":"rawan239","twitter_card":"summary_large_image","twitter_misc":{"Written by":"rawan239","Est. reading time":"2 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/exam.pscnotes.com\/mcq\/consider-the-following-statements-there-is-no-net-moment-on-a-body\/","url":"https:\/\/exam.pscnotes.com\/mcq\/consider-the-following-statements-there-is-no-net-moment-on-a-body\/","name":"Consider the following statements: There is no net moment on a body","isPartOf":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#website"},"datePublished":"2025-06-01T02:48:09+00:00","dateModified":"2025-06-01T02:48:09+00:00","author":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209"},"description":"Let's evaluate each statement: 1. There is no net moment on a body which is in equilibrium. This is correct. A body is in rotational equilibrium if the net torque (moment) acting on it is zero. For complete equilibrium (translational and rotational), both the net force and net moment must be zero. 2. The momentum of a body is always conserved. This is incorrect. The momentum of a body is conserved only if the net external force acting on it is zero. If a net force acts on a body, its momentum changes according to Newton's second law (F = dp\/dt). 3. The kinetic energy of an object is always conserved. This is incorrect. Kinetic energy is conserved only in specific situations, such as elastic collisions where no energy is lost as heat, sound, or deformation, and when no non-conservative forces (like friction) do work on the object, and no external forces change its speed. For example, when an object falls under gravity, its kinetic energy increases. Only statement 1 is correct. - Equilibrium implies zero net force (translational equilibrium) and zero net torque or moment (rotational equilibrium). - Momentum of a system is conserved in the absence of external forces. Momentum of a single body is conserved only if the net force on it is zero. - Kinetic energy of an object is conserved only if no net work is done on it by non-conservative forces or if the system is isolated and interactions are perfectly elastic.","breadcrumb":{"@id":"https:\/\/exam.pscnotes.com\/mcq\/consider-the-following-statements-there-is-no-net-moment-on-a-body\/#breadcrumb"},"inLanguage":"en-US","potentialAction":[{"@type":"ReadAction","target":["https:\/\/exam.pscnotes.com\/mcq\/consider-the-following-statements-there-is-no-net-moment-on-a-body\/"]}]},{"@type":"BreadcrumbList","@id":"https:\/\/exam.pscnotes.com\/mcq\/consider-the-following-statements-there-is-no-net-moment-on-a-body\/#breadcrumb","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https:\/\/exam.pscnotes.com\/mcq\/"},{"@type":"ListItem","position":2,"name":"UPSC CDS-1","item":"https:\/\/exam.pscnotes.com\/mcq\/category\/upsc-cds-1\/"},{"@type":"ListItem","position":3,"name":"Consider the following statements: There is no net moment on a body"}]},{"@type":"WebSite","@id":"https:\/\/exam.pscnotes.com\/mcq\/#website","url":"https:\/\/exam.pscnotes.com\/mcq\/","name":"MCQ and Quiz for Exams","description":"","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/exam.pscnotes.com\/mcq\/?s={search_term_string}"},"query-input":"required name=search_term_string"}],"inLanguage":"en-US"},{"@type":"Person","@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/5807dafeb27d2ec82344d6cbd6c3d209","name":"rawan239","image":{"@type":"ImageObject","inLanguage":"en-US","@id":"https:\/\/exam.pscnotes.com\/mcq\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/761a7274f9cce048fa5b921221e7934820d74514df93ef195a9d22af0c1c9001?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/761a7274f9cce048fa5b921221e7934820d74514df93ef195a9d22af0c1c9001?s=96&d=mm&r=g","caption":"rawan239"},"sameAs":["https:\/\/exam.pscnotes.com"],"url":"https:\/\/exam.pscnotes.com\/mcq\/author\/rawan239\/"}]}},"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts\/84745","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/comments?post=84745"}],"version-history":[{"count":0,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/posts\/84745\/revisions"}],"wp:attachment":[{"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/media?parent=84745"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/categories?post=84745"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/exam.pscnotes.com\/mcq\/wp-json\/wp\/v2\/tags?post=84745"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}